/Engine/Source/Runtime/AudioExtensions/Public/ISoundfieldFormat.h
If this is overridden to true, we will set up a separate encoding stream for every submix plugged into this soundfield submix. Otherwise, we mix all non-soundfield submixes plugged into this soundfield submix together and use one encoding stream.
virtual bool ShouldEncodeAllStreamsIndependently ( const [ISoundfieldEncodingSettingsProxy](API\Runtime\AudioExtensions\ISoundfieldEncodingSettingsProxy) & EncodingSettings )